Drill-sharpener.



E. L. OLDHAM.

DRILLSHARPENER. APPLICATION FILED APR-5. 1915.

Patented Mar. 20; 1917.

9 SHEETS-SHEET I.

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Ens :o.. Funmumou WASNING you 1:v c.

E. L. OLDHAM.

DRILL SHARPENER.

APPLICATION FILED APR. 5. 1915.

Patented Mar. 20, 1917.

9 SHEETSSHEET 2.

PN01D-LIYMU WASHING mu. 0 c.

E. L. OLDHAM.

DRILL SHARPENER.

APPLICATION FILED mm. 1915.

Patented Mar. 20, 1917..

9 SHEETSSHEEI 3.

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E. L. OLDHAM.

DRILL SHARPENER.

APPLICATION FILED APR. 5, 1915.

1,21 9,477. Patented Mar. 20,1917;

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DRILL SHARPENER.

APPLICATION FILED APR.5,1915.

Patented Mar. 20, 1917.

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11 ll UH I/Witnesses 5 E. L. OLD HAM.

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Patented Mar. 20, 1917.

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JNKTED STATESJPATENT @FFEQE.

EDWARD L. OLDHAM, F DENVER, COLORADO, ASSIGNOR TO THE DENVER ROCK DRILLMANUFACTURING COMPANY, OF DENVER, COLORADO, A CORPORATION OF DELA- WARE.

' DRILL-SHARPENER.

Specification of Letters Patent.

Patented Mar. 20, 1917.

Application filed April 5, 1915.. Serial No. 19,315.

ject is to provide a mechanism which is S1II1- ple and effective in itscharacter, and which is convenient to operate, leaving the hands of theworkman free to manipulate the tool being sharpened, and is furthermoreeconomical in the amount of motive fluid utilized, provision being madefor re-using a portion of the motive fluid in the successive operationsof the machine.

In the drawings Figure 1 is a side elevation of a machine embodying thepresent improvements.

. Fig. 2 is a sectional view therethrough at,

right angles to Fig. 1.

Fig. 3 is a plan view of the base or bed of the machine.

Fig. 1 is a rear elevation,partly in sec tion.

Fig. 5 is a view that is diagrammatic in its character, illustrating thecontrolling valve and its connection with the apparatus.

Fig. (Sis a longitudinal sectional view on an enlarged scale through thevalve, showing it in its normal position when the machine is inactive.

Fig. 7 is a similar view taken at right angles to Fig. 6.

Figs. 8, 9 and 10 are views similar to Fig. 8, but showing the valverespectively in different operative positions.

Fig. 11 is a detail sectional view through the dies and the holdingmeans therefor.

Fig. 12 is a front elevation of the structure shown in Fig. 11.

Fig. 13 is a rear elevation of the same.

Fig. 14 is a cross sectional view on the line 14-14c of Fig. 11, and

Fig. 15 is a detail sectional view illustrating the pipe connectionswith the cylinder member of the die operating means.

Similar reference numerals designate corresponding parts in all thefigures of the drawings.

In the embodiment disclosed, a base 16 is through the flange into thebase.

employed having a flange or foot 17 and being substantially hollow,thelowerportion 18 being tubular in form, the upper portion comprisingspaced side walls 19, leaving opposite side openings which are closed bysuitable sliding doors 20. A jaw member 21 is rigidly supported upon theside walls 19, and cooperating therewith is an upper movable jaw member22. These members 21 and 22 carry coacting dies 28 for holding the toolto be operated on.

The jaw member 22 is rigidly fixed to a pair of vertically reciprocatingrods 21 that slidably pass through the lower jaw member 21 and havereduced lower ends 25 slidably mounted in sockets 26 formed in thetubular portion 18 of the base. These side rods are also connected by across head. 27 located just above the said tubular portion 18 of thebase, the cross head being held in place by suitable jam nuts 28threaded on the rods beneath the cross head, said cross head beingabutted against annular shoulders 29 formed upon the said rods.

For the purpose of moving or reciprocating the upper jaw member 22 thefollowing mechanism is employed: A cylinder member 30 is located in thetubular portion 18 of the base, being provided at its lower end with anoutstanding flange 31 that rests against an under-cut shoulder 32 formedin said base, the cylinder member being held in place by bolts 38, orother devices passing In this cylinder member is located a reciprocatorypiston 81, to which is attached a piston rod 35 extending upwardlythrough the upper cylinder head to a point between the side rods 24, andbelow the fixed jaw member 21. Two sets of toggle links 36 are disposedbe tween the rods 24, the upper ends of the sets being suitably pivotedas shown at 37 to the side walls 19 of the base,, their lower ends inlike manner having pivotal connections 38 with the cross head 27. Thecentral pivots 39 of said sets are pivotally connected to the ends of athird set of toggle links 40, which links have their central portionspivoted as shown at 4:1 to the upper end of the piston rod 35. It willthus be evident that if the piston 34. rises, the toggle 10 will bebroken, or in other words, the links will be caused to assume an acuteangular relation. This will draw the links of the toggle 36 into acuteangular relation, so that the cross head 27 and consequently the siderods 2d and the upper aw member 22 will be elevated, opening the jaws.On the other hand, if the piston is depressed, all the sets of togglelinks will be straightened, thereby causing the downward movement of thecross head 27, side rods 24 and the jaw member 22.

As shown more particularly in Figs. 11-14 inclusive, means are providedfor securing the dies 23 to the jaw members 21 and 22. Each of said jawmembers is provided with a substantially semi-circular recess 42 that isenlarged at one end, as shown at 43, the shoulder between the twoportions a2 and &3 being undercut, as illustrated at 1 i. Each die has ashank portion 45 fitting in the recess 4:2, and a head portion 66 thatfits in the enlarged portion 13. The rear end of the head portion 16 hasan undercut shoulder 17 interfitting with the undercut shoulder i l ofthe jaw member. It will thus be evident that this end of the die will beeffectively held in its recess, as long as the die is secured againstlongitudinal displacement. To prevent, such displacement, a cap plate 48is fitted upon the opposite end of the die, being secured in place by aheaded screw 49, said cap plate overlapping the adjacent face of the jawmember and being held against turning by a pin 50 detachably engagedtherein and carried by said jaw member. lVith this construction, it willbe evident that the dies may be readily removed and replaced, but whenin position, are effectively held against accidental detachment.

Projecting from the rear side wall 19 of the base is a platform 51,which in turn supports an upwardly and rearwardly extending bracket 52.On the platform is mounted a horizontally slidable dolly carrier 53having a plurality of dollies 5 1, any one of which can be brought intocooperative relation with the dies 23. The carrier is held in itsdifferent positions by a plunger latch 55 that is mounted in theplatform 51 and engages in any one of a plurality of suitable socketsformed in the bottom of the carrier. The plunger 55 is suitably operatedby a hand lever 56.

The bracket 52 supports a fluid operated hammer 57, which may be of anydesired structure, and it is believed needs no minute description. Thishammer is alined with :the dies 23, and consequently any dolly 5apresented to said dies is in position to be operated on by the hammer ina manner well understood.

There will now be described the means for controlling the operation ofthe dies and of the hammer, and for this purpose, attention isparticularly called to Figs. 510 inclusive. A valve casing 58 is mountedon the rear portion of the base, as shown particularly in Fig. 4, and isprovided with an in ternal valve chamber designated generally by thereference numeral 59. This chamber has a plurality of annular grooves orpockets which are designated respectively 60, 61, 62, 63, 64, 65, 66, 67and 68, said pockets being spaced apart. A motive fluid supply pipe 69communicates with the groove 63, this supply pipe leading from anysuitable source of fluid under pressure, preferably air. Another pipe 70leads to the bottom of the cylinder member 30, and has communication bymeans of a passageway 71 with the bottom groove 66 and the top groove68. Another pipe 7 2 communicates with the upper end of the cylindermember 30 above the piston 34, and has communication with the grooves 61and 66 by means of a connecting passageway 73. A third pipe 74 leads tothe hammer cylinder 57 and is in communication with the groove 65, whilean exhaust pipe or port 75 leads from the groove 67.

Operating in the valve chamber 59 of the valve casing. 58 is areciprocatory piston valve composed of a series of heads, respectivelydesignated 76, 77, 78, and 79, these heads being spaced apart andconnected by neck portions 80, 81 and 82. The valve furthermore has astem 83 projecting downwardly from the lower valve casing head 84, andsaid head is provided with a spring pressed holding plunger 85 that ismovable into and out of either of a pair of grooves 86 formed in saidvalve stem.

The valve casing, as shown more particularly in Fig. 4 is mounted uponthe rear portion of the base, and the lower end of the valve stem restsupon the rear end of a foot treadle 87 fulcrumed between its ends, asshown at 88, on one side of said base. This valve stem is surrounded bya coiled spring 89, the upper end of which bears against the lower head8d of the valve casing 58, the lower end resting upon a collar securedto said valve stem. It will be evident that the spring 89 urges thevalve to its lowermost or normal position.

The statement of the operation of this mechanism may be premised bysaying that these machines have heretofore required a relatively greatamount of air to operate the same, pistons of large area having beenemployed. In the present structure, it will be evident that the dieoperating cylinder is of relatively small diameter, and a further savingis efiected in bypassing the air from one side of the piston to theother. Referring now to Figs. 510 inclusive, Figs. 5, 6 and 7 show thevalve in its lowermost or normal position when the machine is inactive.It will be evident that Fig. 5 is a diagrammatic view, the ports beingshown as diametrically opposite in order that all may be illustrated. Inthis position, the

' supply of motive fluid from the pipe 69 can pass from the groove (38into the groove 62, and thence through the passageway 71 to the pipe 70,so that the piston 8 L will be elevated. and the dies will be opened. Inthis position, it will also be noted that the upper portion ofthe'cylinder member 30 above the piston 8 1 is open to the exhaust,inasmuch as the pipe 72 has communication through the passageway 78 withthe groove 66, and this groove is in communication with the groove 67which communicates with the exhaust pipe 75.

If new a tool. is inserted between the dies and the treadle is presseddownwardly the valve will be elevated and the first position it willassume is that illustrated in Fig. 8. In this position, it will be seenthat the exhaust from the upper end of the cylinder member 30 above thepiston 3% will be closed by the head 7 8 which has moved across thegroove 66, and thus cut off communication betw en said groove and theexhaust groove 67. At the same time, the head 77 has moved upwardly farenough to close the groove 62, so that the supply of motive fluid fromthe pipe 69 cannot now pass through said groove 62, the passageway 71and the pipe to the lower end of the cylinder member, but with theclosure of the supply and exhaust, as above described, there isv openeda bypass between the lower portion of the cylinder vmember below thepiston, and the upper portion of the cylinder member above the piston.This by-pass may be traced as follows :through the pipe 70, the passage71, the groove 60, groove 61, passageway 7 S and pipe 72. It will thusbe seen that the motive fluid compressed below the piston will expandinto the cylinder member above the piston and consequently a portion ofthe fluid employed for elevatin the 11 Joel die and holdin it elevatedr:J. o

is utilized in depressing said die. A continued upward movement of thevalve moves it to the position shown in Fig. 9, in which the motivefluid supply from the pipe 69 now enters the upper end of the cylindermember above the piston 34 by way of the groove 63, groove (it,passageway 73, and pipe 72. At the same time, the exhaust is broughtintocommunication with the lower end of the cylinder member 30 below thepiston 34, inasmuch as the exhaust groove 67 is now in communicationwith the groove 68 that communicates by means of the passageway 71 withthe pipe 70. The result is that the piston will be moved downwardly withforce and the tool will be gripped in the dies. A still further upwardmovement of the valve maintains these relations of the ports, but inaddition, as shown in Fig. 10, it brings the groove 65 intocommunication with the supply groove 63, and as said groove 65 isconnected with the hammer cylinder 57 by the pipe 7 t, the hammer willfinally be thrown into operation. Upon the release of the'i'oot treadle,a reverse action to that above describedwill take place.

It will thus be seen that with this structure a material saving inmotive fluid is effected, the operation of the machine is controlled bya foot treadle, and both hands of the operator are thus free toconveniently manipulate the work.

From the foregoing, it is thought that the construction, operation andmany advantages of the herein described invention will be apparent tothose skilled in the art will out further description, and it will beunderstood that various changes in the size, shape, proportion and minordetails of construction may be resorted to without d'eparting from thespirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is:

1. In apparatus of the character set forth, the combination withcoacting dies, of fluid actuating means for relatively moving the same,a fluid operated hammer, means for supplying fluid under pressure to thedie moving means and to the hammer, and a reciprocatory piston valvecontrolling said supply to first eltect the operation of the dies andafterward the operation of the hammer when said piston valve is moved inone direction and first stopping the operation of the hammer andreleasing the d'es when said piston valve is moved in an oppositedirection, and means for reciproeating the piston valve.

2. In apparatus of the character set forth, the combination withcoacting dies, of fluid actuating means for relatively moving them,comprising a cylinder member and a piston operating therein, means forsupplying fluid under pressure to the cylinder member on both sides ofthe piston, and means for by-passing the fluid from one side to theother.

8. In apparatus of the character set forth, the combination withcoacting dies, of fluid actuating means for relatively moving them,comprising a cylinder member and a piston operating therein, means forsupplying fluid under pressure to the cylinder member on both sides ofthe piston, means for bypassing the fluid from one side to the other,and common mechanism for controlling the supply to both sides and to theby-pass means.

4. In apparatus of the character set forth, the combination withcoacting dies, of fluid actuating means for relatively moving them,

- comprising a cylinder member and a piston operating therein, means forsupplying fluid under pressure to the cylinder member on both sides ofthe piston, means for bypassing the fluid from one side to the other,and a common valve for controlling the supply to both sides of thepiston and through the luv-passing means.

In apparatus of the character set forth, the combination with coactingdies, of fluid actuating means for relatively moving them, including acylinder member and a piston operating therein, means for supplyingfluid to one side of the piston, means forexhausting it from the otherside, and means for bypassing the fluid from one side to the other sideand simultaneously closing the exhaust therefrom and from the fluidsupply means.

6. In apparatus of the character set forth, the combination withcoacting dies, of fluid actuating means for relatively moving them,including a cylinder member and a piston pperating thei in, nreans forsupplying i'luid to one side or tne piston, means for exhausting it fromthe other side, means for by-passing the fluid from one side to theother, and a common valve for controlling the by-pass and exhaust andclosing the exhaust from the fluid supply means when the bypass is open.

7. In apparatus of the character set forth, the combination witheoacting dies, of fluid actuating means for relatively moving them,including a cylinder member and a piston operating therein, means forsupplying fluid to one side of the piston, means for exhausting it fromthe other side, means for by-passing the fluid from one side to theother, and means for opening the fluid supply and exhaust and thereafterclosing the supply and exhaust and opening the bypass while maintainingthe supply and exha .st disconnected.

8. In apparatus of the character set forth, the combination withcoacting dies, of fluid actuating means for relatively moving them,including a cylinder member and a piston operating therein, means forsupplying fluid to one side of the piston, means for exhausting it fromthe other side, means for bypassing the fluid from one side to theother, and a valve for simultaneously opening the fluid supply and theexhaust and thereafter closing said supply and exhaust and opening thebypass While maintaining the supply'and exhaust disconnected from eachother.

9. In apparatus of the character set forth, the combination withcoacting dies, of fluid actuating means for relatively moving them,including a cylinder member and a piston operating therein, means forsupplying mo tive fluid to opposite sides of the piston, means foreXhausing the motive fluid from opposite sides of the piston, a bypassfor admitting motive fluid from one side of the piston to the other, andmeans for opening the motive fluid supply to one side of the piston andthe exhaust from the other side, cutting oil both said supply andexhaust and opening the by-pass.

10. In apparatus of the character set forth, th combination withcoacting dies, offluid actuatingmeans for relatively moving them,including a cylinder member and a piston operating ther in, means forsupplying motive fluid to opposite sides of the pi on, means forexhausting the motive fluid from opposite sides of the piston, a by-passfor admitting motive fluid from one side of the piston to the other, anda valve for opening the motive fluid supply to one side of the pistonand the exhaust from the other side, cutting off both said supply andexhaust and opening the by-pass.

11. In apparatus of the character set forth, the combination withcoasting dies, of means for relatively moving the dies, comprising acylinder member and a piston operating therein, means for supplyingfluid under pressure to the cylinder member, means for by-passing thefluid from one side of the piston to the other side, a hammer, means forsupplying motive fluid thereto, and means for successively controllingthe supply of fluid to the cylinder member and the by-pass and thesupply to the hammer.

12. In apparatus of the character set forth, the combination witheoacting dies, of means for relatively moving the dies, comprising acylinder member and a piston. operating therein, means for supplyingfluid under pressure to the cylinder member, means for lay-passing thefluid from one side of the piston to the other side, a hammer, means forsupplying motive fluid thereto, and a valve for successively controllingthe supply of fluid to the cylinder member, the by-pass, and the supplyto the hammer.

13. In apparatus of the character set forth, the combination withcoacting dies, of means for relatively moving the dies, comprising acylinder member and a piston operating therein, means for supplyingfluid under pressure to the cylinder member on opposite sides of thepiston, means for bypassing the fluid from one side of the piston to theother side, a hammer, means for supplying motive fluid to the hammer,and means for successively controlling the supply of fluid to thecylinder member on one side of the piston, by-passing it to the otherside, closing said by-pass, admitting fluid under pressure to said otherside, and then admitting fluid to the hammer supply.

14:. In apparatus of the character set forth, the combination witheoacting dies, of means for relatively moving the dies, comprising acylinder member and a piston operating therein, means for supplyingfluid under pressure to the cylinder member on opposit sides of thepiston, means for bypassing the fluid from one side of the piston to theother side, a hammer, means for supplying motive fluid to the hammer,and a valve for successively controlling the supply of fluid to thecylinner member on one side of the piston, by-passing it to the otherside, closing said by-pass, admitting fluid under pressure to said otherside, and then admit- 'ting fluid to the hammer supply.

In apparatus of the character set forth, the combination with coastingdies, of means for relatively moving the dies, comprising a cylindermember and a piston operating therein, means for supplying fluid underpressure to the cylinder member, means for exhausting it therefrom,means forbypassing the fluid from one side of the piston to the otherside, a hammer, means for supplying motive fluid to the hammer, andmeans for opening the supply and the exhaust from the cylinder memberand closing the by-pass, thereafter closing said supply and exhaust andopening the bypass, and afterward admitting motive fluid to the hammersupply means.

16. In apparatus of the character set forth, the combination withcoacting dies, of means for relatively moving the dies, including acylinder member and a piston operating therein,-means for supplyingfluid under pressure to the cylinder member on both sides of the piston,means for exhausting fluid from the cylinder member on both sides of thepiston, means for bypassing the fluid from one side of the piston to theopposite side, a hammer, means for supply ing motive fluid to thehammer, and means operating successively to admit fluid to the cylindermember on one side of the piston and simultaneously opening the exhauston the opposite side, thereafter closing said supply and exhaust andopening the bypass, thereafter opening the supply to the opposite sideof the piston and simultaneously opening the exhaust to thefirst-mentioned side, and finally admitting motive fluid to the hammersupply.

17. In apparatus of the character set forth, the combination withcoacting dies, of means for relatively moving the dies, including acylinder member and a piston op erating therein, means for supplyingfluid under pressure to the cylinder member on both sides of the piston,means for exhausting fluid from the cylinder member on both sides of thepiston, means for bypassing the fluid from one side of the piston to theopposite side, a hammer, means for supplying motive fluid to the hammer,and a valve op erating successively to admit fluid to the cylindermember on one side of the piston and simultaneously opening the exhauston the opposite side. thereafter closing said supply and exhaust andopening the by-pass,

thereafter opening the supply to the opposite side of the piston andsimultaneously opening the exhaust to the first-mentioned side, andfinally admitting motive fluid to the hammer supply.

18. in apparatus of the character set forth, the combination withcoacting dies, of means for relatively moving the same, including acylinder member and a piston operating therein, a valve casing having asupply port and outlet ports communicating with the cylinder member onopposite sides of the piston, and a valve operating in the casing andcontrolling the ports to connect the supply port with either of theoutlet ports and for bringing both of said outlet ports intocommunication with each other to bypass the fluid from one side of thepiston to the other.

19. In apparatus of the character set forth, the combination withcoacting dies, of means for relatively moving the same, including acylinder member and a piston operating therein, a valve casing having asupply port, an exhaust port, and outlet ports con'nnunicating with thecylinder member on opposite sides of the piston, and a valve operatingin the casing and controlling the ports to connect the supply port witheither of the outlet ports and the other outlet port with the exhaustport and for bringing the outlet ports into communication with eachother to by-pass the fluid from one side of the piston to the other andsimultaneously closing the supply and ex haust ports to both outletports.

20. In apparatus of the character set forth, the comhination withcoacting dies, of means for relatively moving the same including acylinder member and a piston operating therein, a fluid operated hammer,a valve casing having a supply port, an outlet port communicating withthe hammer, and other outlet ports communicating with the cylindermember on opposite sides of the piston, and a valve operating in theeasing and controlling the ports to connect the supply port with eitherof the outlet ports to'the cylinder member, said valve also operating tobring the outlet ports into communication with each other and beingmovable to bring the outlet port and the ham mer into communication withthe supply port.

21. In apparatus of the character set forth, the combination withcoacting dies, of fluid operated means for relatively mov ing the same,a fluid operated hammer, a valve casing having a supply port and outletports respectively communicating with the die-moving means and hammer, areciprocatory piston valve operating in the casing to cause the supplyport to be first brought into communication with one outlet port, thenith the other outlet port and maintain simultaneous communicationbetween the supply port and both outlet ports, and means forreciprocating the valve.

22. In apparatus of: the character set forth, the combination withcoacting dies, of fluid operated means for relatively moving the same, afluid operated hammer, a valve casing having a supply port and outletports respectively communicating with the diemoving means and hammer, areciprocatory piston valve operating in the casing to first affordcommunication between the supply port and the outlet port leading to thedie moving means, maintaining such communication and secondly affordingcommun1ca-, tion with the port leading to the hammer, and meansconnected to the valve for eflecting its reciprocation.

23. In apparatus of the character set forth, the combination withcoacting dies, of fluid operated means for relatively moving the same, afluid operated hammer, a valve casing having a plurality of internalchambers, a supply port communicating with one of the chambers, outletports from other of the chambers communicating respectively with the diemoving means and the hammer, a reciprocatory piston valve operating inthe valve casing and having means for successively connecting the supplychamber with the outlet chambers to first move the dies and thereafterset the hammer in operation, and means for reciprocating the pistonvalve.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

EDWARD L. OLDHAM.

Witnesses:

F. L. EMERSON, A. H. SKAER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, .D. C.

